Dynamo-electric machine or motor



A TTORNE V.

(No Model.)

0. L. ROSENQVIST.

DYNAMO ELECTRIC MACHINE 0R MOTOR. No. 405,602. PatentedJune 18, 1889.

' Conradl. fzoseizqucls W S i UNITED STATES PATENT OFFICE.

CONRAD L. ROSENQVIST, OF YONKERS, NEW YORK.

DYNAMO-ELECTRIC MACHINE O R MOTOR.

SPECIFICATION forming part of Letters Patent No. 405,602, dated June 18, 1889.

Application filed February 13, 1889. Serial No. 299,724. (No model.)

T to whom, it may concern;

Be it known that I, CONRAD L. ROSENQVIsT, a citizen of the United States, residing in Yonkers, in the county of \Vestchester and State of New York, have invented certain new and useful Improvements in Dynamo-Electric Machines or Motors, of which the following is a specification.

My invention relates to dynamo-electric machines or motors, with particular reference to the armatures and commutators of the same.

The object of the invention is to provide an efficient machine of cheap construction.

The armature is of the Gramme type; and it consists of a core of iron wire, around which fiat copper strips, representing the coils, are placed. The copper strips of each turn or convolution are four in number, and are arranged in a rectangular shape, with their extremities riveted together. The inner strip, or the one which runs parallel to the shaft, is extended to form a segment of the commutator.

The details of the construction will be hereinafter described.

Referring to the drawings, Figure 1 represents a central section of the armature and commutator; Fig. 2, a front elevation of the same, and Fi 3 a detail of the copper strips surrounding the core.

The shaft is represented by A. It has keyed to it a brass hub B, and over this hub is passed a sleeve of vulcabeston or other hard insulating material C. This sleeve extends from the outer end of the commutator through to the opposite end of the armature. Its object is to insulate the armature and commutator from the shaft. The thickness of the sleeve is not the same throughout its length, the thinnest port-ion being at or about the center and gradually thickening toward the ends, as shown in Fig. 1. The purpose of this will be described later on.

The electric conductors of the armature are made up of strips of copper a, b b, and 0. Of these strips a is the longest, and extends out over the insulating-sleeve to form a segment of the commutator. To the strip a is riveted the two strips 1) Z) at right angles thereto, and the outer ends of strips Z) are connected by a cross-strip 0. These compose the convolution. Of course it is not essential that every strip a should be extended, inasmuch as the root angular convolution may be continued into a second convolution, and as many more as desired, to represent one coil of the armature. In building the armature the strips 1) b are riveted to the strips to a, and they are then placed in position around the shaft. Then iron wire D is wound around them in the manner of winding thread upon a spoolthat is to say, thespaces between the strips 1) b is nearly filled with iron wire. The wire is wound on under tension, so that the strips a will be bent inward at their middle portions toward the shaft to fill up the space made by thinning the vulcabeston sleeve. In this way the core and strips or coils are prevented from slipping longitudinally on the insulating-sleeve. Before the iron wire is wound the space inclosed by the strips 1) b and a is filled with insulating material of any suitable kind, and after the wire is wound thereon the outer surface of the winding is covered with insulating material, and the strips 0 c are placed across this surface and riveted to the proj ecting ends of b b. It is to be understood that all the strips are insulated from each other. The spaces between the strips 0 c on the circumference are necessarily quite wide, and they are filled. in with strips of sheet-iron c. This brings the iron of the core close to the pole-pieces. The whole structure is bound together by wire bands 6 e on the armature and f on the outer end of the commutator.

In order to prevent the armature and commutator from slipping or turning on sleeve of insulating material C, the said sleeve is grooved longitudinally at several points-say fouraround its surface, and a corresponding number of the strips c are made wider and lit into these grooves. This prevents all radial movement of the armature and commutator with respect to the sleeve. The copper bars or strips are made comparatively wide, and this for the purpose of preventing eddy currents. I prefer to rivet the strips together rather than solder them, for the reason that solder is liable to be melted and cause injury to the machine.

Having described my invention, I claim The combination, with the main shaft, of a sleeve of insulating material thereon, said sleeve being reduced in diameter between its extremities, and an armature made up of coils of copper strips surrounding acore ofiron wire, my name in the presence of two subscribing the said wire being wound under tension and witnesses. bending the copper stnps toward the shaft Y '1 1 7 l 7' V V and against the surface of the sleeve, whereby COL RAD 5 the armature is prevented from slipping off WVitnesses:

the sleeve. CHESTER XV. NEWMAN,

In witness whereof I have hereunto signed XVILLIAM RILEY. 

